Ah, I thought that could be the only thing that could jive with what you had said. In the long run, I guess the difference between 7 and 8 in the same size mag would be reliability?

Not really, what gets altered in the mag is the skirt of the follower and modern 8rd mags are pretty reliable, you can get 8 round mags that stick just a bit out the bottom from Wilson that are very reliable.